the Od is weaker whatever that means , I had the od in my Duster for 9 years dumping the clutch at 5500-6500 RPM it broke numerous 8 3/4s but never hurt the tranny , you wnat a n earlier OD though , the later OD had less splines on the syncro hubs , still never seen one fail though
The od does use a larger case & brgs so it is tougher than most 23 spline trannys